The problem with aluminum wiring is that it expands and contracts excessively, which creates loose connections and, ultimately, arcing problems. When it arcs, it usually does so without tripping the breaker. This is a definite fire hazard and can be very dangerous. Copper wiring is much more stable in this regard.
For more information about aluminum wiring visit: http://inspectapedia.com/fpe/fpepanel.htm or give us a call at 301-583-8888.
They are dangerous – they do not meet the Underwriters Laboratory (UL) standards. Please refer to our dedicated webpage for FPE panels or search online yourself. There is a lot of information available on this topic.
Special Advice to Heat Pump Owners: Heat pumps need to stay at a constant setting, unless you have a programmable electronic heat pump thermostat with adaptive recovery. Check with your heating or air conditioning contractor to determine the type of thermostat you have.